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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (in shares) at Dec. 31, 2017 112,634,418        
Balances at Dec. 31, 2017 $ 1,126 $ 931,858 $ 164,425 $ (182) $ 1,097,227
Net income 0 0 41,399 0 41,399
Comprehensive income (loss), net of tax $ 0 0 0 (964) (964)
Stock options exercised (in shares) 221,400        
Stock options exercised $ 2 2,043 0 0 2,045
Release of restricted stock units, net of tax (in shares) 16,957        
Release of restricted stock units, net of tax $ 0 (364) 0 0 (364)
Release of performance stock units, net of tax (in shares) 337,537        
Release of performance stock units, net of tax $ 4 (5,274) 0 0 (5,270)
Shares repurchased and retired (in shares) (559,089)        
Shares repurchased and retired $ (6) (19,797) 0 0 (19,803)
Dividends declared 0 0 (5,635) 0 (5,635)
Share-based compensation costs 0 8,927 0 0 8,927
Comprehensive income, net of tax $ 0 0 (312) 312 0
Balances (in shares) at Mar. 31, 2018 112,651,223        
Balances at Mar. 31, 2018 $ 1,126 917,393 199,877 (834) 1,117,562
Balances (in shares) at Dec. 31, 2017 112,634,418        
Balances at Dec. 31, 2017 $ 1,126 931,858 164,425 (182) 1,097,227
Net income         $ 92,181
Shares repurchased and retired (in shares) [1],[2]         (1,273,000)
Shares repurchased and retired [2]         $ (44,822)
Balances (in shares) at Sep. 30, 2018 112,004,327        
Balances at Sep. 30, 2018 $ 1,120 904,521 237,196 (1,002) 1,141,835
Balances (in shares) at Mar. 31, 2018 112,651,223        
Balances at Mar. 31, 2018 $ 1,126 917,393 199,877 (834) 1,117,562
Net income 0 0 38,945 0 38,945
Comprehensive income (loss), net of tax $ 0 0 0 (306) (306)
Stock options exercised (in shares) 19,836        
Stock options exercised $ 0 208 0 0 208
Release of restricted stock units, net of tax 0 0 0 0 0
Release of performance stock units, net of tax $ 0 0 0 0 0
Shares repurchased and retired (in shares) (300,719)        
Shares repurchased and retired $ (2) (10,527) 0 0 (10,529)
Dividends declared 0 0 (6,742) 0 (6,742)
Share-based compensation costs $ 0 6,022 0 0 6,022
Balances (in shares) at Jun. 30, 2018 112,370,340        
Balances at Jun. 30, 2018 $ 1,124 913,096 232,080 (1,140) 1,145,160
Net income 0 0 11,837 0 11,837
Comprehensive income (loss), net of tax $ 0 0 0 138 138
Stock options exercised (in shares) 45,254        
Stock options exercised $ 1 566 0 0 567
Release of restricted stock units, net of tax (in shares) 1,820        
Release of restricted stock units, net of tax $ 0 (23) 0 0 (23)
Release of performance stock units, net of tax $ 0 0 0 0 $ 0
Shares repurchased and retired (in shares) (413,087)       (413,000) [1],[2]
Shares repurchased and retired $ (5) (14,485) 0 0 $ (14,489) [2]
Dividends declared 0 0 (6,721) 0 (6,721)
Share-based compensation costs $ 0 5,367 0 0 5,367
Balances (in shares) at Sep. 30, 2018 112,004,327        
Balances at Sep. 30, 2018 $ 1,120 904,521 237,196 (1,002) $ 1,141,835
Balances (in shares) at Dec. 31, 2018 111,757,105       111,757,105
Balances at Dec. 31, 2018 $ 1,118 892,331 253,357 (1,065) $ 1,145,741
Net income 0 0 45,451 0 45,451
Comprehensive income (loss), net of tax $ 0 0 0 465 465
Stock options exercised (in shares) 137,063        
Stock options exercised $ 1 1,261 0 0 1,262
Release of restricted stock units, net of tax (in shares) 46,958        
Release of restricted stock units, net of tax $ 0 (418) 0 0 (418)
Release of performance stock units, net of tax (in shares) 270,960        
Release of performance stock units, net of tax $ 3 (3,768) 0 0 (3,765)
Shares repurchased and retired (in shares) (830,100)        
Shares repurchased and retired $ (8) (21,645) 0 0 (21,653)
Dividends declared 0 0 (6,683) 0 (6,683)
Share-based compensation costs $ 0 9,709 0 0 9,709
Balances (in shares) at Mar. 31, 2019 111,381,986        
Balances at Mar. 31, 2019 $ 1,114 877,470 292,125 (600) $ 1,170,109
Balances (in shares) at Dec. 31, 2018 111,757,105       111,757,105
Balances at Dec. 31, 2018 $ 1,118 892,331 253,357 (1,065) $ 1,145,741
Net income         $ 133,340
Shares repurchased and retired (in shares) [1],[2]         (1,087,000)
Shares repurchased and retired [2]         $ (28,044)
Balances (in shares) at Sep. 30, 2019 111,144,780       111,144,780
Balances at Sep. 30, 2019 $ 1,111 882,652 364,453 (69) $ 1,248,147
Balances (in shares) at Mar. 31, 2019 111,381,986        
Balances at Mar. 31, 2019 $ 1,114 877,470 292,125 (600) 1,170,109
Net income 0 0 48,484 0 48,484
Comprehensive income (loss), net of tax 0 0 0 (12) (12)
Stock options exercised $ 0 0 0 0 0
Release of restricted stock units, net of tax (in shares) 13,075        
Release of restricted stock units, net of tax $ 1 (136) 0 0 (135)
Release of performance stock units, net of tax $ 0 0 0 0 0
Shares repurchased and retired (in shares) (245,221)        
Shares repurchased and retired $ (4) (6,104) 0 0 (6,108)
Dividends declared 0 0 (7,781) 0 (7,781)
Share-based compensation costs $ 0 8,158 0 0 8,158
Balances (in shares) at Jun. 30, 2019 111,149,840        
Balances at Jun. 30, 2019 $ 1,111 879,388 332,828 (612) 1,212,715
Net income $ 0 0 39,405 0 39,405
Stock options exercised (in shares) 3,416        
Stock options exercised $ 0 27 0 0 27
Release of restricted stock units, net of tax (in shares) 2,878        
Release of restricted stock units, net of tax $ 0 (38) 0 0 (38)
Release of performance stock units, net of tax $ 0 0 0 0 $ 0
Shares repurchased and retired (in shares) (11,354)       (11,000) [1],[2]
Shares repurchased and retired $ 0 (284) 0 0 $ (284) [2]
Dividends declared 0 0 (7,780) 0 (7,780)
Share-based compensation costs 0 3,559 0 0 3,559
Comprehensive income, net of tax $ 0 0 0 543 $ 543
Balances (in shares) at Sep. 30, 2019 111,144,780       111,144,780
Balances at Sep. 30, 2019 $ 1,111 $ 882,652 $ 364,453 $ (69) $ 1,248,147
[1] All shares repurchased have been retired and constitute authorized but unissued shares.
[2] Shares repurchased reflect repurchases settled during the three and nine months ended September 30, 2019 and 2018. These amounts exclude repurchases traded but not yet settled on or before September 30, 2019 and 2018.